/Engine/Source/Runtime/RHI/Public/GPUDefragAllocator.h
Split allocation into two, first chunk being used and second being available. Maint32ains the free-list order if bSortedFreeList is true.
void Split ( [FMemoryChunk](API\Runtime\RHI\FGPUDefragAllocator\FMemoryChunk) * BaseChunk, int64 FirstSize )